2013-11-17 00:33:54 +07:00
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/*
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* An RTC driver for Allwinner A10/A20
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*
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* Copyright (c) 2013, Carlo Caione <carlo.caione@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/types.h>
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#define SUNXI_LOSC_CTRL 0x0000
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#define SUNXI_LOSC_CTRL_RTC_HMS_ACC BIT(8)
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#define SUNXI_LOSC_CTRL_RTC_YMD_ACC BIT(7)
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#define SUNXI_RTC_YMD 0x0004
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#define SUNXI_RTC_HMS 0x0008
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#define SUNXI_ALRM_DHMS 0x000c
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#define SUNXI_ALRM_EN 0x0014
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#define SUNXI_ALRM_EN_CNT_EN BIT(8)
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#define SUNXI_ALRM_IRQ_EN 0x0018
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#define SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN BIT(0)
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#define SUNXI_ALRM_IRQ_STA 0x001c
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#define SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND BIT(0)
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#define SUNXI_MASK_DH 0x0000001f
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#define SUNXI_MASK_SM 0x0000003f
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#define SUNXI_MASK_M 0x0000000f
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#define SUNXI_MASK_LY 0x00000001
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#define SUNXI_MASK_D 0x00000ffe
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#define SUNXI_MASK_M 0x0000000f
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#define SUNXI_GET(x, mask, shift) (((x) & ((mask) << (shift))) \
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>> (shift))
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#define SUNXI_SET(x, mask, shift) (((x) & (mask)) << (shift))
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/*
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* Get date values
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*/
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#define SUNXI_DATE_GET_DAY_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 0)
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#define SUNXI_DATE_GET_MON_VALUE(x) SUNXI_GET(x, SUNXI_MASK_M, 8)
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#define SUNXI_DATE_GET_YEAR_VALUE(x, mask) SUNXI_GET(x, mask, 16)
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/*
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* Get time values
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*/
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#define SUNXI_TIME_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0)
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#define SUNXI_TIME_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8)
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#define SUNXI_TIME_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16)
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/*
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* Get alarm values
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*/
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#define SUNXI_ALRM_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0)
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#define SUNXI_ALRM_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8)
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#define SUNXI_ALRM_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16)
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/*
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* Set date values
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*/
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#define SUNXI_DATE_SET_DAY_VALUE(x) SUNXI_DATE_GET_DAY_VALUE(x)
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#define SUNXI_DATE_SET_MON_VALUE(x) SUNXI_SET(x, SUNXI_MASK_M, 8)
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#define SUNXI_DATE_SET_YEAR_VALUE(x, mask) SUNXI_SET(x, mask, 16)
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#define SUNXI_LEAP_SET_VALUE(x, shift) SUNXI_SET(x, SUNXI_MASK_LY, shift)
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/*
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* Set time values
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*/
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#define SUNXI_TIME_SET_SEC_VALUE(x) SUNXI_TIME_GET_SEC_VALUE(x)
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#define SUNXI_TIME_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8)
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#define SUNXI_TIME_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16)
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/*
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* Set alarm values
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*/
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#define SUNXI_ALRM_SET_SEC_VALUE(x) SUNXI_ALRM_GET_SEC_VALUE(x)
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#define SUNXI_ALRM_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8)
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#define SUNXI_ALRM_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16)
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#define SUNXI_ALRM_SET_DAY_VALUE(x) SUNXI_SET(x, SUNXI_MASK_D, 21)
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/*
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* Time unit conversions
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*/
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#define SEC_IN_MIN 60
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#define SEC_IN_HOUR (60 * SEC_IN_MIN)
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#define SEC_IN_DAY (24 * SEC_IN_HOUR)
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/*
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* The year parameter passed to the driver is usually an offset relative to
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* the year 1900. This macro is used to convert this offset to another one
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* relative to the minimum year allowed by the hardware.
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*/
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#define SUNXI_YEAR_OFF(x) ((x)->min - 1900)
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/*
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* min and max year are arbitrary set considering the limited range of the
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* hardware register field
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*/
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struct sunxi_rtc_data_year {
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unsigned int min; /* min year allowed */
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unsigned int max; /* max year allowed */
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unsigned int mask; /* mask for the year field */
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unsigned char leap_shift; /* bit shift to get the leap year */
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};
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static struct sunxi_rtc_data_year data_year_param[] = {
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[0] = {
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.min = 2010,
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.max = 2073,
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.mask = 0x3f,
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.leap_shift = 22,
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},
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[1] = {
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.min = 1970,
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.max = 2225,
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.mask = 0xff,
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.leap_shift = 24,
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},
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};
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struct sunxi_rtc_dev {
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struct rtc_device *rtc;
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struct device *dev;
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struct sunxi_rtc_data_year *data_year;
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void __iomem *base;
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int irq;
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};
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static irqreturn_t sunxi_rtc_alarmirq(int irq, void *id)
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{
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struct sunxi_rtc_dev *chip = (struct sunxi_rtc_dev *) id;
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u32 val;
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val = readl(chip->base + SUNXI_ALRM_IRQ_STA);
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if (val & SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND) {
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val |= SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND;
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writel(val, chip->base + SUNXI_ALRM_IRQ_STA);
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rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static void sunxi_rtc_setaie(int to, struct sunxi_rtc_dev *chip)
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{
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u32 alrm_val = 0;
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u32 alrm_irq_val = 0;
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if (to) {
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alrm_val = readl(chip->base + SUNXI_ALRM_EN);
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alrm_val |= SUNXI_ALRM_EN_CNT_EN;
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alrm_irq_val = readl(chip->base + SUNXI_ALRM_IRQ_EN);
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alrm_irq_val |= SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN;
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} else {
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writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND,
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chip->base + SUNXI_ALRM_IRQ_STA);
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}
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writel(alrm_val, chip->base + SUNXI_ALRM_EN);
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writel(alrm_irq_val, chip->base + SUNXI_ALRM_IRQ_EN);
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}
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static int sunxi_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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{
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
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struct rtc_time *alrm_tm = &wkalrm->time;
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u32 alrm;
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u32 alrm_en;
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u32 date;
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alrm = readl(chip->base + SUNXI_ALRM_DHMS);
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date = readl(chip->base + SUNXI_RTC_YMD);
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alrm_tm->tm_sec = SUNXI_ALRM_GET_SEC_VALUE(alrm);
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alrm_tm->tm_min = SUNXI_ALRM_GET_MIN_VALUE(alrm);
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alrm_tm->tm_hour = SUNXI_ALRM_GET_HOUR_VALUE(alrm);
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alrm_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date);
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alrm_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date);
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alrm_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date,
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chip->data_year->mask);
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alrm_tm->tm_mon -= 1;
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/*
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* switch from (data_year->min)-relative offset to
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* a (1900)-relative one
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*/
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alrm_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year);
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alrm_en = readl(chip->base + SUNXI_ALRM_IRQ_EN);
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if (alrm_en & SUNXI_ALRM_EN_CNT_EN)
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wkalrm->enabled = 1;
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return 0;
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}
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static int sunxi_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
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u32 date, time;
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/*
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* read again in case it changes
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*/
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do {
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date = readl(chip->base + SUNXI_RTC_YMD);
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time = readl(chip->base + SUNXI_RTC_HMS);
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} while ((date != readl(chip->base + SUNXI_RTC_YMD)) ||
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(time != readl(chip->base + SUNXI_RTC_HMS)));
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rtc_tm->tm_sec = SUNXI_TIME_GET_SEC_VALUE(time);
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rtc_tm->tm_min = SUNXI_TIME_GET_MIN_VALUE(time);
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rtc_tm->tm_hour = SUNXI_TIME_GET_HOUR_VALUE(time);
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rtc_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date);
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rtc_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date);
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rtc_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date,
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chip->data_year->mask);
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rtc_tm->tm_mon -= 1;
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/*
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* switch from (data_year->min)-relative offset to
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* a (1900)-relative one
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*/
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rtc_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year);
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return rtc_valid_tm(rtc_tm);
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}
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static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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{
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
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struct rtc_time *alrm_tm = &wkalrm->time;
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struct rtc_time tm_now;
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2015-06-12 09:04:12 +07:00
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u32 alrm;
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time64_t diff;
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unsigned long time_gap;
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unsigned long time_gap_day;
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unsigned long time_gap_hour;
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unsigned long time_gap_min;
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int ret;
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2013-11-17 00:33:54 +07:00
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ret = sunxi_rtc_gettime(dev, &tm_now);
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if (ret < 0) {
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dev_err(dev, "Error in getting time\n");
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return -EINVAL;
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}
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2015-06-12 09:04:12 +07:00
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diff = rtc_tm_sub(alrm_tm, &tm_now);
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if (diff <= 0) {
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2013-11-17 00:33:54 +07:00
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dev_err(dev, "Date to set in the past\n");
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return -EINVAL;
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}
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2015-06-12 09:04:12 +07:00
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if (diff > 255 * SEC_IN_DAY) {
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dev_err(dev, "Day must be in the range 0 - 255\n");
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return -EINVAL;
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}
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time_gap = diff;
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2013-11-17 00:33:54 +07:00
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time_gap_day = time_gap / SEC_IN_DAY;
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time_gap -= time_gap_day * SEC_IN_DAY;
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time_gap_hour = time_gap / SEC_IN_HOUR;
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time_gap -= time_gap_hour * SEC_IN_HOUR;
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time_gap_min = time_gap / SEC_IN_MIN;
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time_gap -= time_gap_min * SEC_IN_MIN;
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sunxi_rtc_setaie(0, chip);
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writel(0, chip->base + SUNXI_ALRM_DHMS);
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usleep_range(100, 300);
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alrm = SUNXI_ALRM_SET_SEC_VALUE(time_gap) |
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SUNXI_ALRM_SET_MIN_VALUE(time_gap_min) |
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SUNXI_ALRM_SET_HOUR_VALUE(time_gap_hour) |
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SUNXI_ALRM_SET_DAY_VALUE(time_gap_day);
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writel(alrm, chip->base + SUNXI_ALRM_DHMS);
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writel(0, chip->base + SUNXI_ALRM_IRQ_EN);
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writel(SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN, chip->base + SUNXI_ALRM_IRQ_EN);
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sunxi_rtc_setaie(wkalrm->enabled, chip);
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return 0;
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}
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static int sunxi_rtc_wait(struct sunxi_rtc_dev *chip, int offset,
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unsigned int mask, unsigned int ms_timeout)
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{
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const unsigned long timeout = jiffies + msecs_to_jiffies(ms_timeout);
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u32 reg;
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do {
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reg = readl(chip->base + offset);
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reg &= mask;
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if (reg == mask)
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return 0;
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} while (time_before(jiffies, timeout));
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return -ETIMEDOUT;
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}
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static int sunxi_rtc_settime(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
|
|
|
|
u32 date = 0;
|
|
|
|
u32 time = 0;
|
|
|
|
int year;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* the input rtc_tm->tm_year is the offset relative to 1900. We use
|
|
|
|
* the SUNXI_YEAR_OFF macro to rebase it with respect to the min year
|
|
|
|
* allowed by the hardware
|
|
|
|
*/
|
|
|
|
|
|
|
|
year = rtc_tm->tm_year + 1900;
|
|
|
|
if (year < chip->data_year->min || year > chip->data_year->max) {
|
|
|
|
dev_err(dev, "rtc only supports year in range %d - %d\n",
|
|
|
|
chip->data_year->min, chip->data_year->max);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
rtc_tm->tm_year -= SUNXI_YEAR_OFF(chip->data_year);
|
|
|
|
rtc_tm->tm_mon += 1;
|
|
|
|
|
|
|
|
date = SUNXI_DATE_SET_DAY_VALUE(rtc_tm->tm_mday) |
|
|
|
|
SUNXI_DATE_SET_MON_VALUE(rtc_tm->tm_mon) |
|
|
|
|
SUNXI_DATE_SET_YEAR_VALUE(rtc_tm->tm_year,
|
|
|
|
chip->data_year->mask);
|
|
|
|
|
|
|
|
if (is_leap_year(year))
|
|
|
|
date |= SUNXI_LEAP_SET_VALUE(1, chip->data_year->leap_shift);
|
|
|
|
|
|
|
|
time = SUNXI_TIME_SET_SEC_VALUE(rtc_tm->tm_sec) |
|
|
|
|
SUNXI_TIME_SET_MIN_VALUE(rtc_tm->tm_min) |
|
|
|
|
SUNXI_TIME_SET_HOUR_VALUE(rtc_tm->tm_hour);
|
|
|
|
|
|
|
|
writel(0, chip->base + SUNXI_RTC_HMS);
|
|
|
|
writel(0, chip->base + SUNXI_RTC_YMD);
|
|
|
|
|
|
|
|
writel(time, chip->base + SUNXI_RTC_HMS);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* After writing the RTC HH-MM-SS register, the
|
|
|
|
* SUNXI_LOSC_CTRL_RTC_HMS_ACC bit is set and it will not
|
|
|
|
* be cleared until the real writing operation is finished
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
|
|
|
|
SUNXI_LOSC_CTRL_RTC_HMS_ACC, 50)) {
|
|
|
|
dev_err(dev, "Failed to set rtc time.\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
writel(date, chip->base + SUNXI_RTC_YMD);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* After writing the RTC YY-MM-DD register, the
|
|
|
|
* SUNXI_LOSC_CTRL_RTC_YMD_ACC bit is set and it will not
|
|
|
|
* be cleared until the real writing operation is finished
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
|
|
|
|
SUNXI_LOSC_CTRL_RTC_YMD_ACC, 50)) {
|
|
|
|
dev_err(dev, "Failed to set rtc time.\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sunxi_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
|
|
{
|
|
|
|
struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
if (!enabled)
|
|
|
|
sunxi_rtc_setaie(enabled, chip);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct rtc_class_ops sunxi_rtc_ops = {
|
|
|
|
.read_time = sunxi_rtc_gettime,
|
|
|
|
.set_time = sunxi_rtc_settime,
|
|
|
|
.read_alarm = sunxi_rtc_getalarm,
|
|
|
|
.set_alarm = sunxi_rtc_setalarm,
|
|
|
|
.alarm_irq_enable = sunxi_rtc_alarm_irq_enable
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct of_device_id sunxi_rtc_dt_ids[] = {
|
2014-04-04 04:50:02 +07:00
|
|
|
{ .compatible = "allwinner,sun4i-a10-rtc", .data = &data_year_param[0] },
|
2013-11-17 00:33:54 +07:00
|
|
|
{ .compatible = "allwinner,sun7i-a20-rtc", .data = &data_year_param[1] },
|
|
|
|
{ /* sentinel */ },
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, sunxi_rtc_dt_ids);
|
|
|
|
|
|
|
|
static int sunxi_rtc_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct sunxi_rtc_dev *chip;
|
|
|
|
struct resource *res;
|
|
|
|
const struct of_device_id *of_id;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
|
|
|
|
if (!chip)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, chip);
|
|
|
|
chip->dev = &pdev->dev;
|
|
|
|
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
chip->base = devm_ioremap_resource(&pdev->dev, res);
|
|
|
|
if (IS_ERR(chip->base))
|
|
|
|
return PTR_ERR(chip->base);
|
|
|
|
|
|
|
|
chip->irq = platform_get_irq(pdev, 0);
|
|
|
|
if (chip->irq < 0) {
|
|
|
|
dev_err(&pdev->dev, "No IRQ resource\n");
|
|
|
|
return chip->irq;
|
|
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev, chip->irq, sunxi_rtc_alarmirq,
|
|
|
|
0, dev_name(&pdev->dev), chip);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&pdev->dev, "Could not request IRQ\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
of_id = of_match_device(sunxi_rtc_dt_ids, &pdev->dev);
|
|
|
|
if (!of_id) {
|
|
|
|
dev_err(&pdev->dev, "Unable to setup RTC data\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
chip->data_year = (struct sunxi_rtc_data_year *) of_id->data;
|
|
|
|
|
|
|
|
/* clear the alarm count value */
|
|
|
|
writel(0, chip->base + SUNXI_ALRM_DHMS);
|
|
|
|
|
|
|
|
/* disable alarm, not generate irq pending */
|
|
|
|
writel(0, chip->base + SUNXI_ALRM_EN);
|
|
|
|
|
|
|
|
/* disable alarm week/cnt irq, unset to cpu */
|
|
|
|
writel(0, chip->base + SUNXI_ALRM_IRQ_EN);
|
|
|
|
|
|
|
|
/* clear alarm week/cnt irq pending */
|
|
|
|
writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, chip->base +
|
|
|
|
SUNXI_ALRM_IRQ_STA);
|
|
|
|
|
|
|
|
chip->rtc = rtc_device_register("rtc-sunxi", &pdev->dev,
|
|
|
|
&sunxi_rtc_ops, THIS_MODULE);
|
|
|
|
if (IS_ERR(chip->rtc)) {
|
|
|
|
dev_err(&pdev->dev, "unable to register device\n");
|
|
|
|
return PTR_ERR(chip->rtc);
|
|
|
|
}
|
|
|
|
|
|
|
|
dev_info(&pdev->dev, "RTC enabled\n");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sunxi_rtc_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct sunxi_rtc_dev *chip = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
rtc_device_unregister(chip->rtc);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver sunxi_rtc_driver = {
|
|
|
|
.probe = sunxi_rtc_probe,
|
|
|
|
.remove = sunxi_rtc_remove,
|
|
|
|
.driver = {
|
|
|
|
.name = "sunxi-rtc",
|
|
|
|
.of_match_table = sunxi_rtc_dt_ids,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
module_platform_driver(sunxi_rtc_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("sunxi RTC driver");
|
|
|
|
MODULE_AUTHOR("Carlo Caione <carlo.caione@gmail.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|